Ice cube



FIG. 1 is an upper perspective representational view of the ice cube;

FIG. 2 is a lower perspective representational view of the ice cube;

FIG. 3 is a top plan view of the ice cube;

FIG. 4 is a first side view of the ice cube;

FIG. 5 is a second side view of the ice cube;

FIG. 6 is a bottom plan view of the ice cube; and,

FIG. 7 is a cross-sectional view of the ice cube taken on line 7-7 of FIG. 4. 

CLAIM The ornamental design for an ice cube, as shown and described. 